Mandrel-cementing apparatus



May 6, 1930. c. E. MAYNAR D MANDREL CEMENTING APPARATUS 4 Sheets-SheetFiled Feb. 14, 1927 1 NV EN TOR.

A TTOR Y.

y 1930- c. E. MAYNARD I 1,757,128

MANDREL CEMENTING APPARATUS IIIi/i/II/YI/I/IIIII.

1 N VEN TOR.

May-6, 1930. c. E. MAYNARD MANDREL CEMENTING APPARATUS 4 Sheets-Sheet 3Filed Feb. 14, 1927 g::r;-.-

INVE-NVTOR. W

May 6, 1930. c. E. MAYNARD MANDREL CEMENTING- APEARATUS Filed Feb. 14,1927 4 Sheets-Sheet 4 INVENTOR.

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Patented May 6, 1930 UNITED STATES CHARLES EDGAR MAYNARD, ornon'rnamrrroiv. MASSACHUSETTS, Assmn'on To run,

PATENT OFFICE A FISK RUBBER COMPANY, OF CHICOPEE FALLS, MASSACHUSETTS, ACORPORATION OF MASSACHUSETTS KANDREL-CEMENTING APPARATUS Application andFebruary 14, 1927. Serial in. 107,940.

This invention relates to apparatus for use in the manufacture of rubbertubes such as innertubes for automobile tires. and has particularreference to apparatus for use in performing the process described in mycopending application Serial No. 111,968; filed May 27, 1926.

One object ofm-y invention is to provide an apparatus by which aplurality of mandrels may receive successivelybands ofcement adjacenttheir ends. A further object is to'provide an apparatuswhich will applya uniform uantity of cement to the mandrels. A furmerge to form wide?bands. A further object is to provide an apparatus by which rubber tubesmay he made expeditiously and cheaply, and without thenecessity of usingany external binding or sealing means for the tube ends duringvulcanization. Other objects will appear from the followingdescriptionand claims. V y

Referring to the drawings,

Fig. 1 is a top plan View of an apparatus constructed in ac'cordancewith my invention; i

Fig. 2 is a' side elevation thereof;

Figs. 3, 4, and 5 are details illustrating the operation of one of thecementing mechanisms; 1

Fig. 6 is a detail, on line 6-6 of Fig. 7, illustrating the constructionof one of the cementing mechanisms;

Fig. 7 is a side elevation of one of the cementing mechanisms;

Fig. 8 is a top view of one of the cementing mechanisms. on line 88 ofFig. 7

Fig. 9 is a detail of an adjusting mechanism; and

' Fig. 10 is a plan view showing the manncr of handling the mandrelsafter cementing.

The apparatus comprises generally devices for receiving the mandrels asthey are delivered to the tube-building unit-as, for .in-

stance, as they are removed from a heater andthe vulcanized tubestripped; from them,a"

cemeuting device for applying bands of ce ment to the mandrels adjacenttheir ends, a

drying rack or conveyor which carries the cemented mandrels to a stationwhere they are taken by the operators who are to roll the rubber stockupon them. The mandrels 11 are in the case illustrated fed to themachine upon a conveyor 12,carried in suitable bearings upon a frame 13.I The mandrels are re moved from the conveyor 12 by operators who stripoff the vulcanized tubes and place the mandrels upon inclined trackways14.

trackways extend completely across the various devices to be describedbelow, and Y are supported by a frame 13 and by frames 15 and 16 whichalso carryother parts of the devices. 7

The mandrels roll down the trackways 14 by gravity until they meet theends 17 of ledges 18 formed thereon (Figs. 7 and 8). 1

At this point they rest until raised onto the ledges by plungers 19running-in bearings 20 secured to the bottoms of thetrackways. Atpredetermined periods the plungers are raisedto starta mandrel throughthe cycle of operations to be described. The distance between the cndsof the ledges and the upper ends of the trackyvays is preferably greatenough to allow aspace for accumulation of mandrels to insure thatv asupply. shall always be present. V

The mechanism for raising the plungers 19 comprises an arm 21 for eachplunger, fixed to a shaft 22 and connected to one of the plungers by alink 23. The shaft 22 is oscillated at intervals by an-arm 24 fixed toit and carrying at its end a. cam roll 25 running in the groove 26 of aface cam 27. A short. shaft 2 carried in bearings 29 attached to frame13. supportsboth the cam 27 and a sprocket 30 by which-it is driven.motion being given to the sprocket 30 by a chain 31 passing also arounda sprocket 32 on a stub shaft 33 (Fig. 2). By means of a motor 34;chains 35.36. and 37;

.and'suitable sprockets on shafts 38 and 39;

the shaft- 33 is driven in synchronism with other parts of theapparatus.

shown in Fig. 8, each ,ofthe ledges 41 is mounted in slidewa s 42 and isfitted with a depending threade lug'43 through WhlCh passes a screw 44;"A collar 45 'hol the screw from endwise'movement in-one direction, anda-handwheel 46 prevents itfrom moving oppositely. Rotation of thehandwheel will thus cause the ledge 41 to be moved one way or anotherlon itudinally of the screw. The purpose oft is arrangement is to lowerthemandrels onto the trackways ata pointwhich can be predetermined inaccordance with the diameter of the mandrels. The 'cementing'aparatus-to be described be= low'Presents-ban s of cement of a constant ,4length, and to avoid more than a complete circumference of cement beingplaced upon the mandrel the latter is kept out of contact with thecementing deviceuntil such a point; p 3 that the remainder ofthe lengthof the cementing device correspondsto the circumference of the mandrel.

Each cementing device is made laterally adjustable to care for diiferentlengths of tubes (adjustment for difl'erent diameters being accomplishedby the ledges 41 asabove described), and is-cogiposed' preferably of a's 47 which dip into a plurality of spaced r tank 48 containing rubbercement and then move into position to appl the cement .to the mandrelsas the latter r0 l down the trackway 14 oil the ledges. The rods arecarried by small lugs49 (Fig.6) on arms 50 pivoted upon a shaft 51 andhaving their major ortions 52 formed upon the arc of a circle w losecenter is the pivot shaft. Shaft 51 is carried in bearings 53 attachedto a large adjustable'bracket 54. p i

Lateral adjustment of the brackets 54 (there beingone of those at eachside of the machine to support the cementing devices at the two ends ofthe mandrels) is secured by sliding them upon a casting 55 which isfastened to pedestals 56 carried upon the frame 13. A shaft 57 passesfrom one side of the machine to the other, being journaled inthepedestals 56, and is formed with, right and left threaded portionsengaging nuts 58 secured tothe brackets 54. By means-of a handwheel 59on one end'of the shaft the latter can be rotated to vary simultaneouslythe separation of the two cementing devices while maintaining them atequivalent dis- ,tances from the center line of-the machine.

The several cement applying rods 47 of merging each unit are so operatedas to cause them to separate from an original close spacing on leavingthe cement in orderto prevent a web being formed between them and anundue amount ofcement being picked up, and are subsequently againbrought into close spacing before the mandrel is caused to roll overthem. Their original position is, shown in. Fig. 3, where they are,bunched sufliciently to rmit their entering the comparatively sha owcement tank 48.- In'Fig. '4 they are shown in the process of emerl'gingfrom the tank in separated osition., .ig. 5 shows-the final position 0the rods as they apply the contiguous' bands of cement to the tubemandrel. Operation of the arms 50,is derived from the same cam 27 thatactuates the plungers I 19. Arms. 60,. one for each cementing unit,'

are keyed to the shaft 22 and are connected by links 61 to rockin levers62. ivoted to the bracket 54. at 63.- he twp-1i s 61 of each unit arepinned to, the ends of rods 64' and .65,"the formerof which is pinned toarm oted at 68 to the lever-'66, a housing69 screwed onto the'body,and'a rod 70 pivoted to the.-

arms 50. Each offthese rods passesinto its respective housing and has anenlar ed end 71 between which and the end of the ousing is. located aspring 72. The space betweenthe sprin and thehousin'g'varies-progressively in t e several connections, as is clearlyshown'inFig. '7' in order to secure the separation of the rodsillustrated in Fig. 4.

. The manner in which the cement rods are one at the right end of theseries shown in Fig. 7, each housing is made long enough to avoidcontact with the sprin 72 until after a short downward motion. e extentof this motion varies in the difl'erent housings,"be-- ing chosen sothat contact with the respective springs will occur progressivelybeginning with the right hand housingand ending with that at the left.This results in the rods 70 being started downwardly in the sameprogressive order. The action produced -.upon" the arms 50 and thecement applying rods 47 is shown in Fig. '4, where it is apparent thatthe rods are separated from v their originally closely spaced positionsand are in the course of being moved upwardly. As this upward motionproceeds set screws 7 3 carried by extensions of arms 50 strike againstthe bracket 54 and sto the arms individually and successively 1n theclosely spaced position of Fig. 5, ready to apply the r coating ofcement to a. mandrel. Further 5 downward motion of the housings 69causes a compression of springs 72 with no corresponding motion beinggii'en to the rods 47. This series of motions allows the rods to pick upa coating of cement, drain the cement while in separated positions. andapply the cement to a mandrel 11 while again closely spaced.

As the rods near the position of Fig. 5 the plungers 19'are rising, andwhen the rods are finally ready to receive a mandrel the plunger hasgonehigh enough to raise one over the shoulder 17. The mandrel then Iruns down. ledges 18 and 41, dropping 011' the curved end of the latterat the correct place 20 to roll over the rods 47 and pass off their endsafter having made exactly one revolution in contact with the cementstrips.

Tracks 14 are so arranged relative to the cement applying rods 47 thatthe mandrels do not make contact with the rods themselves but with thecement film only. The mandrels after having picked up the cement bandsroll down tracks 14 and pile up against ledges 74 at their lower end(Fig.1). A suitable mandrel separating device may be installed at thispoint if desired, but a single solution of the problem of keeping thecemented areas of adjacent mandrels out of contact is to provide themandrels with enlarged ends 75. When the mandrels strike one anotherthese ends prevent contact of the mandrel bodies or of the cementmaterial upon them.

Above the lower end of trackwav 14 is a tube rolling table 76 upon whichthe sheet rubber stock 77 is laid. When the operator is ready to startthe rollingof a tube he picks up the lowermost mandrel in the trackwayand places it upon the edge of the rubber sheet. A sufiicientnumberofcemented mandrels are kept in the trackway at all times so that by thetime one of'them is taken out the cement has dried. During this storageperiod the cement first spreads laterally to form an even coating andthen loses most of its volatile constituent. Although dry, the cementdoes not lose its tackiness and adheres firmly to the rubber sheet asthe latter is rolled upon the mandrel.

As the rolling is completed the mandrel is pushed onto a trackway 78where itis taken by pushing rollers 79 on' conveyors 80 and carrled overelectrically heated knives81 which trim thetube to length. The cut whichtrims the tube is preferably made just inside the outer edge of thecement, so that the extreme end of the trimmed tube will firmly adhereto the mandrel. Beyond the straight trimming cut 82 a spiral cut 83 ismade in order to facilitate .the removal of the excess rubber at the endof the tube. The pushers 79 deposit the mandrels successively on a beltconveyor 84 which carries the mandrel and tube to a point where theexcess rubber can be pulled oii and the mandrels loaded into avulcanizer.

Having thus described my invention, I claim:

1. In a mandrel cementing machine, a

' ing a mandrel in cement-transferring rolling contact with that surfaceat a point intermediate the length of said surface in the direction ofthe travel of the mandrel, and a device for adjusting the position ofthe point of contact. 7

4. In amandrel cementing machine, an inclined trackway, a cementingdevice, a mandrel stop on the trackway above said device, means forcausing said device to present a film of cement to be picked up by amandrel rolling down the trackway, and means actuated in timed relationtherewith for releasing a mandrel. .'5. In a mandrel cementing machine,a cement tank. a plurality of cement carrying rods, supporting devicesfor carrying the rods temporarily during said arcuate movemen CHARLESEDGAR MAYNARD.

